Company Profile

Introduction

We are a professional and famous EMI filter manufacturer.

Our technical team has more than 10 years' experience in designing EMI filter. We know UL, VDE, CSA, CE, CQC etc safety standards very well.

Our technical service team learns many kinds of test standards such as industrial applications (IEC61800-3 for frequency inverter drive, EN12015 for elevator, EN55011 for ISM device etc) and military applications (GJB151A, GJB152A etc). We can solve EMI problems quickly, effectively, and cost-effectively.

Our test equipment: LCR digital bridge / voltage proof tester / insulation resistance tester / spectrum analyzer / inductor tester / standard signal source / shield room / interference intensity tester etc.

Our products: EMI filter for general purpose / EMI filter for frequency inverter / EMI filter for shielding facility / EMI filter for military application.

Our advantage: high quality / high cost-effective / short lead time.

Our service: all products have a two-year guarantee.

Our main customers: frequency inverter drive and servo drive systems / MRI shielding systems / solar inverter systems / rail transit systems etc.

History

Service & EMC Testing Standards

Conducting emission exceeding test is to test whether the equipment under test (EUT) passes the limit of electromagnetic disturbance under the standard frequency band according to the relevant national / industry regulations. Conducting emission test, also known as disturbance voltage test, involves all products as long as they have power lines, including many DC power supply products. In addition, there are also requirements regarding the signal / control lines conducting emission in many standards, usually expressed by the limit of disturbance voltage or disturbance current. The insertion loss test (expressed directly by dB) in lamps and lanterns also falls into the category of conduction test.

3. Conducting Emission Test Method

1) Instruments and equipment used for conducting emission test: Receiver, LISN (line impedance stabilization network, or AMN artificial power network), Analog Hand, Passive Voltage Probe, Current Probe (CDN used in conjunction with current probe, capacitive voltage probe), DIA (Intermittent interference analyzer used for testing intermittent interference in CISPR14-1), a whole set of equipment for measuring insertion loss and so on. Of course, the PC is also needed. DIA should comply with the requirements of CISPR16-1-1, and other auxiliary devices should comply with the requirements of CISPR16-1-2.

2) Conducting emission test arrangement: There are two types, test on the table or on the floor. Desktop equipment is 80 cm away from LISN, 40 cm off the ground flat (here the ground plate can be horizontally connected floor, or the vertical earthing wall of the shielded room). The distance from the ground equipment to the ground plate is allowed to vary according to different standards.

3) Frequency band of conducting emission test: Mostly 150kHz-30MHz, but CISPR15 is an exception, for which the disturbance voltage is 9kHz-30MHz and insertion loss 150kHz-1605kHz.

4) Conducting emission test limits: It varies with different standards and different product categories (Group 1 / 2, Class A / B).

5) Conducting emission test process:

• AC / DC power disturbance voltage: Connect the power plug to the LISN, the receiver RF input is connected to the RF output of the LISN, and the L/N switch of the LISN is switched to select the common mode disturbance voltage to the ground of the test power line.
• Intermittent interference: Required by CISPR14-1 and some standards which quote CISPR14-1, usually tested using intermittent interference analyzers in conjunction with LISN.
• The load disturbance voltage: Required in CISPR14-1 / CISPR15 and CISPR11. The passive voltage probe is used to measure the disturbance voltage of the load line terminal to the ground directly.
• The communication line disturbance voltage / current: Mentioned in CISPR22. It mainly depends on the different combination of current probe and CDN, 150$\Omega$ earth resistance, and capacitive voltage probe.
• Insertion loss: Mentioned in CISPR15. Using a receiver to measure comparative voltage after the signal generated by RF sine wave generator passes through balanced/unbalanced converter.

4. Conclusion of results of the conducted emission test: Compare the measured values (QP/AV) of receiver geophone with the limit line, if the measured values are lower than the limit line, PASS, otherwise, FAIL.

Our Team

Since its foundation in 2003, we specialize in product research and development in the EMC field, capable of providing full lines of EMC solutions and products while focusing on customizing products to meet customers' specific requirements. The products and services we provide cover EMI filters, signal filters, passive harmonic filters, filter connectors, EMC components, etc. Our products are widely deployed in high-tech fields such as inverter and converter applications, photovoltaic systems, medical devices, automatic controlled machine tools, electric power supply, telecommunication, robots, etc.

In order to provide superior products and service to our customers, we established our own laboratory, which is equipped with a shielding room, surge generator, pulse group generator, spectrum analyzer, signal source, and other high-end equipment to meet customers' all kinds of EMC test needs. On the other hand, we can design products meeting the requirements of customers more accurately and rapidly since more test means are available for us with the help of the lab. Besides, we set up cooperation centers in Germany, Italy, and South Korea in order to win further trust and development in the international markets.